Trigonometry Calculator
Calculate the sine, cosine, or tangent of an angle, in degrees or radians.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter an angle (in degrees or radians) and choose sine, cosine, or tangent to calculate its trigonometric value.
Your result
0.707
Result
AI explanation
Formula
sin, cos, or tan of the angle (converted to radians first if entered in degrees)Worked example
sin(45°)
| Field | Value |
|---|---|
| Angle | 45 |
| Angle unit | degrees |
| Function | sin |
| Result | 0.7071067812 |
Assumptions
- Tangent is undefined at angles like 90° and 270° (and their radian equivalents), where cosine is zero — this calculator rejects those inputs.
Frequently asked questions
What's the difference between degrees and radians?
Degrees divide a full circle into 360 parts; radians measure angle by arc length relative to the radius, so a full circle is 2π radians. Use the Degree Radian Converter to switch between them directly.
Why is tangent sometimes "undefined"?
Tangent is sine divided by cosine, so it's undefined wherever cosine equals zero — at 90°, 270°, and their equivalents in every full rotation.
Is this the same as using a scientific calculator?
Yes, for these three functions — see the Scientific Calculator for a general expression evaluator that also handles arithmetic and more.